Frame structure for a high chair



FIG. 1 is a front perspective view of a frame structure for a high chair according to my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The even short dashed broken lines shown in the drawing are for illustrative purposes only and form no part of the claimed design. The longer dashed lines within the claimed framed structure represent shading. 

I claim the ornamental design for a frame structure for a high chair, as shown and described. 